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Full color organic electroluminescence display devices by thermal patterning using laser and method for manufacturing the same

a full color, organic technology, applied in the direction of luminescence screens, discharge tubes, thermal imaging, etc., can solve the problems of deterioration of interfacial properties, degradation of efficiency and lifetime, and degradation of luminous properties including efficiency and lifetime, and achieve the effect of large-scale pixel regions

Active Publication Date: 2008-08-26
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]It is another aspect of the present invention to provide a full color organic EL display device capable of ensuring large scaled pixel regions and a method for manufacturing the same.

Problems solved by technology

In the case of single color devices, the organic EL device using the polymer may be simply fabricated using the spin coating process, however, it has a disadvantage that efficiency and lifetime are degraded in spite of a low driving voltage compared to the small molecular type.
When a full color device is fabricated, each of the red, green, and blue color polymers should be patterned, which causes luminous properties including efficiency and lifetime to be degraded when an inkjet printing method or a laser induced thermal imaging (LITI) method is used.
The LITI method uses a donor film which is not a proper material when it is applied to a substrate with a complicated structure having stepped regions, and in particular, it is not preferable to use the donor film because external physical force is applied to surfaces of the substrate and the light-emitting layer when it is attached or detached thereto to thereby deteriorate interfacial properties.
In addition, in the case of the polymer which forms the light-emitting layer, molecular weight is large so that adhesive strength of the film becomes higher after the LITI process is performed, which causes transfer properties to be deteriorated.
As a result, R, G, B patterning for the full color organic EL display device generally uses shadow mask technology to the latest, which is not suitable for patterning a large scaled display device.
However, in this method, a photo-acid generator which is blended to cure an exposed portion may cause impurities to infiltrate inside, and super acid resulted from curing may cause active materials to be damaged so that reliability or lifetime of the device may be adversely affected.

Method used

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  • Full color organic electroluminescence display devices by thermal patterning using laser and method for manufacturing the same
  • Full color organic electroluminescence display devices by thermal patterning using laser and method for manufacturing the same
  • Full color organic electroluminescence display devices by thermal patterning using laser and method for manufacturing the same

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first embodiment

[0028]To detail this, as shown in FIG. 2, the full color organic EL display device in accordance with the present invention comprises a substrate 50a, a light-to-heat conversion layer 51a formed over the entire surface of the substrate 50a, a first electrode layer 52a formed and patterned on the light-to-heat conversion layer 51a, an organic layer including first, second, and third light-emitting layers 60R, 60G, and 60B patterned on the first electrode layer 52a, and a second electrode layer 56a formed on the organic layer over the entire surface of the substrate 50a. The full color organic EL display device having the above-mentioned structure is fabricated by the following steps of forming the light-to-heat conversion layer 51a on the substrate 50a, patterning the first electrode layer 52a on the light-to-heat conversion layer 51a, forming an insulating layer 53a for defining first, second, and third pixel regions on the first electrode layer 52a, applying a first thermosetting l...

second embodiment

[0055]FIG. 3 is a cross-sectional view of a full color organic EL display device in accordance with the present invention.

[0056]As shown in FIG. 3, the full color organic EL display device comprises a first electrode layer 52b, a light-to-heat conversion layer 51b, an organic layer including at least each one of red, green, and blue light-emitting layers 60R, 60G, and 60B, and a second electrode layer 56b, which are stacked in this order on a substrate 50b.

[0057]The method for manufacturing the full color organic EL display device having the above-mentioned structure and materials are the same as the first embodiment, and the second embodiment differs from the first embodiment in that the light-to-heat conversion layer 51b and the first electrode layer 52b are differently formed.

third embodiment

[0058]FIG. 4 is a cross-sectional view of a full color organic EL display device in accordance with the present invention.

[0059]As shown in FIG. 4, the full color organic EL display device comprises a light-to-heat conversion layer (100a) functioning as an electrode, an organic layer including at least each one of first, second, and third light-emitting layers 60R, 60G, and 60B, and a second electrode layer 56a, which are stacked in this order on the substrate 50a.

[0060]The full color organic EL display device having the above-mentioned structure is fabricated by the following steps of: patterning a light-to-heat conversion layer 100a capable of acting as an electrode on the substrate 50a; forming an insulating layer 53a for defining first, second, and third pixel regions on the light-to-heat conversion layer 100a capable of acting as the electrode; applying the first thermosetting light-emitting material 54R on the pixel regions, selectively irradiating a laser only on the first p...

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Abstract

An organic electroluminescence display device made by a laser induced thermal imaging process has a substrate having first and second electrode layers, and an organic layer having red, green, and blue light-emitting layers between the electrode layers. Thermosetting light-emitting materials are used to form the red, green, and blue light-emitting layers, and a laser is then selectively irradiated onto a light-to-heat conversion layer formed on the substrate to deliver heat energy converted from light energy through the light-to-heat conversion layer to the thermosetting light-emitting materials so that curing is progressed to form patterned light-emitting layers. In accordance with the fabrication method of the present invention, the light-emitting materials may be patterned using a laser, thereby fabricating a large scaled organic electroluminescence display device and simplifying the process by not using a mask when the light-emitting layers are formed.

Description

CLAIM OR PRIORITY[0001]This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for FULL COLOR ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICES BY THERMAL PATTERNING USING LASER AND METHOD FOR MANUFACTURING THE SAME earlier filed in the Korean Intellectual Property Office on 29 Nov. 2003 and there duly assigned Serial No. 2003-86125.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to, an organic electroluminescence (EL) device, more particularly to a full color organic electroluminescence (EL) display device, which enables light-emitting layers to be patterned by introducing a thermosetting light-emitting material and a light-to-heat conversion layer capable of converting light energy of a laser to heat energy and a method for manufacturing the same.[0004]2. Description of the Related Art[0005]In general, an organic EL display device is composed of se...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L51/50H05B33/10H01L27/32H01L51/00H01L51/56H05B33/12
CPCH01L27/3211H01L51/56H01L51/5012H01L51/0013H01L51/0035H01L51/0038H01L51/0036Y10S428/917H10K59/35H10K71/18H10K85/114H10K85/113H10K85/111H10K50/11H10K71/00H05B33/10
Inventor YANG, NAM-CHOULKANG, TAE-MINSONG, MYUNG-WONLEE, SEONG-TAEKSUH, MIN-CHULCHIN, BYUNG-DOOKIM, MU-HYUN
Owner SAMSUNG DISPLAY CO LTD